JPS6131211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing corrugated curled yarn.
More specifically, it concerns a method for producing high-quality wavy crimped yarn that has a wavy crimped form and gives a satin surface effect, gloss, drapability, etc. to the fabric, and includes at least two incompletely drawn yarns. The present invention relates to a method for manufacturing a corrugated curled yarn obtained by successfully specifying the tension ratio before and after merging using the method, and then performing a temporary twisting process while drawing.

Many methods have been known in the past for producing curled yarns having characteristics such as appearance and texture by aligning a plurality of multifilament yarns and subjecting them to a temporary twisting process of curling, heat setting, and loosening. For example, there is a method of manufacturing composite curled yarn or knotted yarn by winding one filament yarn around the other filament yarn while temporarily twisting it, or a method of manufacturing composite curled yarn or knotted yarn by arranging filament yarns with different melting points and fusion bonding process. Methods for producing yarn and the like have been proposed.

However, the yarns obtained by these techniques are, for example, curly yarns in which two filament yarns are intertwined by alternating S and Z twists, and the yarn form can bring about special changes in the appearance of the fabric. Rather, it aims to improve the texture by combining different types of filament yarns, and it is fundamentally different from the wavy curled yarn obtained by the manufacturing method of the present invention in terms of appearance, texture, and gloss. It is something that

Next, as proposed in Japanese Patent Publication No. 47-50675, a twist is added to the ends of the two multifilament yarns, and the confluence angle is 60 to 120 at the beginning of pulling and twisting.
Composite yarn obtained by a manufacturing method characterized by temporary twisting at ゜ and fiber splitting partially forms a coil-like curl in the longitudinal direction of the yarn, resulting in a "grained" texture in the fabric.
It is expressed as follows. However, such coiled crimping has the disadvantage that the coil portion tends to stretch and has poor recovery properties, resulting in "stiffness", poor drapability, and castella-like appearance. Furthermore, the present invention is characterized in that two multifilament yarns are aligned and merged using a merging guide at the same tension before, during, or after heat setting, and a fusion temporary twisting process is performed to separate the fibers. The semi-fused crimped yarn obtained by this method has a large residual torque and requires reheating, and as a result, the wavy crimped portion of the crimped yarn is stretched, resulting in a satin-like surface when applied to fabric. The effect becomes less noticeable, or fluctuations in the tension balance of both yarns before and after merging can cause ``irritability and unevenness'', and the essential problems of fusion bonding and twisting processing include hardening of the texture and decreased drapability. Such drawbacks occur.

In view of these disadvantages of the conventional technology, the purpose of the present invention is to improve the satin surface effect and uniformity or drapability, and to improve quality defects such as "warai", castella look, and rough and hard feeling. The purpose of the present invention is to provide a method for producing high-quality corrugated curled yarn with high efficiency.

That is, the method for producing a corrugated curled yarn of the present invention involves pulling together at least two thermoplastic synthetic fiber filament yarns with substantially the same tension between a temporary twist area feed roller and a temporary twist spindle via a merging guide. Twist and join together and add - heat fixation -
A wavy-shaped curled yarn characterized in that when applying the temporary twisting process to the unraveled yarn, a supplied yarn and an incompletely drawn yarn are used, and the tension ratio before and after merging is 1.5 or more, and the temporary twisting process is performed while being stretched. (however, tension ratio = provisional twisted tension (g/single yarn after merging)/tension before merging (g/single yarn)).

Hereinafter, the method for producing the corrugated curled yarn of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a process schematic diagram showing a preferred embodiment of the method of the present invention.

In the figure, incompletely drawn yarns 1 and 2 of thermoplastic synthetic fibers are unwound through guides 3 and 4, and are drawn and fed to a feed roller 5 that is temporarily stretched. The yarns are twisted and combined by the merging guide 7 between the heater 6 and the temporary twisting spindle 8 with substantially the same tension, and the yarns are temporarily twisted by the spindle and wound up from the delivery roller 9 onto the cheese 10.

To explain in more detail, the yarn to be supplied is a filament made of incompletely drawn yarn with a birefringence Δr=15×10 ^-3 to 60×10 ^-3 such as undrawn yarn or semi-drawn yarn of thermoplastic synthetic fiber. Use at least two threads. Then, the supplied yarns are arranged in the temporary twisting area, preferably between the heater and the spindle, and particularly preferably, the yarns are merged immediately after passing through the heater.

By setting such a merging position, it becomes easier to obtain high-quality corrugated curled yarn by the method of the present invention than when the merging point is located between the feed roller and the heater or on the heater. By using incompletely drawn yarn, stretching occurs between the feed roller and the merging guide, between the merging guide and the spindle, and the delivery roller, and especially between the merging guide and the spindle, there is stretching due to temporary twisting. At the same time, this is due to the fact that the formation of curvaceous fibers occurs more easily than in completely drawn yarns.

Since the propagation of twisting from the merging guide toward the feed roller is extremely small compared to a completely drawn yarn, the unevenness of twisting propagation of both yarns is small. The propagation of such twist is closely related to the tension ratio before and after passing through the merging guide, and as the tension ratio increases, less of the twist propagates upstream (to the feed roller side), and the tension balance between the two yarns is improved. As a result, a uniform shape of Kanenyoriguse can be obtained.
According to the findings of the present inventors, the tension ratio to achieve this uniform shaping is generally about 1.5 or less when using a normal fully drawn yarn.
In the method of the present invention, by using incompletely drawn yarn and adjusting the drawing and pre-twisting processing conditions so that the tension ratio is 1.5 or more, uniform shaping of the yarn can be achieved.

Next, the number of tentative twists should be equal to or higher than the number set for normal woolly processing, and the set temperature should also be above the softening point. In both cases, the harsher the conditions, the greater the effect of shaping the wave shape. .

After the temporary twisting process, it is wound up into a double thread as shown in FIG.
It is also possible to load the bobbin 14 from there. In this case, the addition direction is preferably the unresolved direction in order to restore the distortion of the temporary addition, that is, the addition direction is preferable, but if it is the opposite, the effect of the present invention will be weakened.

In addition, as shown in FIG. 2b, before winding the yarn around cheese, it is reset with a reheat heater 15 to form a modified yarn, which is separated between a relaxation roller 16 and a delivery roller 17 and then wound around cheese 18 and 19. You can also do that. Further, as shown in FIG. 2c, before being rolled up into cheese, a fluid entangling process can be performed using an interlacer 20 between a temporary twisting delivery roller and a relaxation roller 21, and the cheese 22 can be rolled up.

The next explanation of the wavy curled yarn produced in this way is that the yarn form is made up of a wavy curled yarn formed by a temporary twisting process, and it has curly undulations. It's summery.

To explain in more detail, the wavy weave septu increases the apparent number of twists during the temporary twisting process and becomes fine and deep because it uses incompletely drawn yarn with a low torsional Young's modulus and a large thermal setting effect. In addition, the merging tension ratio during temporary twisting increases, and the twisting is stopped by the merging guide, making it difficult for it to propagate upstream, and the tension balance between both yarns is maintained, resulting in a uniform wave-shaped twisting. .

When the curled yarn obtained according to the present invention is applied to a fabric, the presence of the corrugated shape provides a deeper and more uniform satin-like surface effect than that obtained with the prior art, and the quality is further improved. Furthermore, as for the texture, since temporary twisting is performed while drawing, the cross-sectional structure of the curled yarn can be easily varied by changing the drawing ratio and setting temperature.
By setting a low processing magnification or a high setting temperature, it is possible to fuse or bond only the center of the single fiber bundle of the curled yarn, and the unfused portion of the outer layer or It is also possible to form a two-layer structure between the adhesive and the non-adhesive area, thereby emphasizing the "smooth feel" and "dry touch."

Next, the yarn characteristic of the curled yarn is that it has a residual torque in the direction of temporary twisting, but when it is twisted, the torque disappears in the direction of twisting, which improves the passability in subsequent processes such as knitting and weaving.

In other words, as mentioned above, when adding yarn in the direction of the temporary twist, both yarns are integrated and added in the same direction, that is, in the direction of the unresolved yarn, so the convergence is extremely strong and the temporary twist process This acts to cancel out the residual torque generated by the curling, so the torque of the curled yarn is almost negligible.

Of course, the torque can also be reduced by a modification set or a fluid entanglement process as shown in FIGS. 2b and 2c. The elasticity is not large because it is an undissolved cotton yarn, or it has been subjected to modifier setting and fluid entangling treatment, so when it is applied to a fabric, it has a moderate bulk height and elongation without "stickiness". characteristics can be obtained.

Examples are shown below.

Example 1 Incompletely drawn yarn of polyester filament 75 denier (denier after drawing), 36 filament 2
Using this, the heater and spindle are merged as shown in Figure 1, and the merge tension ratio is 2.8 (22.5
(g)/8(g)), Z with a tentative twist number of 2960T/m
As a result of stretching in the Z direction at a setting temperature of 230°C and a processing draw ratio of 1.7 times, and applying a temporary twisting process, and further stretching at 100 T/m in the Z direction, a good wave shape with a stretch recovery rate of 21.5% and residual torque of almost zero was obtained. A shrunken yarn was obtained. When the yarn was knitted into a 28-gauge jersey, no problems such as bias were observed, and an extremely high-quality fabric with a deep and uniform satin surface effect was obtained.

Example 2 When carrying out temporary twisting while stretching in the same manner as in Example 1, the stretching ratio was increased to 2.3 times so that the combined tension ratio was 2.0 (32 (g) / 16 (g)), and the same procedure was carried out as follows. As a result of processing under the same conditions, a fabric of almost the same level as Example 1 could be obtained.

Comparative Example Using two fully drawn polyester filament yarns of 75 denier and 36 filament yarns, the confluence tension ratio was 1.4 (25
(g)/18(g)), Z with tentative twist number 2960T/m
After temporary twisting in the Z direction at a set temperature of 230°C and a feed rate of -2%, it was not possible to obtain a fabric with a deep and uniform satin surface effect similar to Example 1. Nakatsuta.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram illustrating one embodiment of the method for manufacturing a corrugated curled yarn of the present invention, and FIG. 2 is a process diagram of the main parts illustrating the application of the post-process. 1, 2: incompletely drawn yarn, 3, 4, 12: guide, 5: feed roller, 6: heater, 7: merging guide, 8: temporary twist spindle, 9, 11, 1
7: Delivery roller, 10, 18, 19, 2
2: Pick up cheese, 13: Traveler, 14: Bobbin, 15: Reheat heater, 16, 21: Relax roller.

Claims (1)

[Claims] 1 At least two thermoplastic synthetic fiber filament yarns are pulled together with substantially the same tension, twisted and merged from the temporary twist area feed roller to the temporary twist spindle via a merging guide, and then added - heat set -
A wave-shaped curled yarn characterized in that, when performing the temporary twisting process on the woven yarn, an incompletely drawn yarn is used as the supplied yarn, and the tension ratio before and after merging is 1.5 or more, and the temporary twisting process is performed while being stretched. manufacturing method (however, tension ratio=temporary twisted tension (g/single yarn after merging)/tension before merging (g/single yarn)).